1×4光子晶体波导分束器的特性

The Properties of a 1×4 Optional Power Splitter Made of Photonic Crystal Waveguide

在完整的二维光子晶体中引入线缺陷,形成了光子晶体波导,光子晶体波导分束器是集成化光学电路的重要组成元件。我们设计了一种线缺陷1×4光子晶体分束器,并且用有限时域差分法研究了它的特性。研究表明,输出端的透射传输特性与入射光的波长和分支的几何形状有关,并且入射波分别相等地流入四个输出端口。为了减少1×4分束器在三个Y型分支区的反射,可以通过调节在分支区的可调介质柱的半径R,使每个输出端口具有很高的透射率。

Photonic crystal（PC） is a new artificial material. Its in fabricating novel optical devices. Optical power splitters made become essential components for compact photonic integrated unique optical properties enable it to be used of photonic crystal waveguides are believed to circuits. It can engender photonic crystal waveguide （PCW） in the complate two-dimensional photonic crystals by introducing line defects. We designed a 1 × 4 optical power splitter made of linear-defect waveguides in photonic crystals, and analyzed its properties using the finite-difference time-domain method. Results showed that the transmission properties vary with wave frequency and branch geometry, and that an incident wave is divided equally into four output parts. To reduce the reflections at the three Y-branching regions in the 1 × 4 splitter, we can adjust the radius of the medium cylinder in the branching region, and achieve high transmission for R =0.13a at each output waveguide. We analyzed the physical origins of this performance and this kind of multi-mode interference may find potential application in PC optical circuits.